Class: Gearbox::Attribute

Inherits:
Object
  • Object
show all
Defined in:
lib/gearbox/attribute.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Attribute

Returns a new instance of Attribute.



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# File 'lib/gearbox/attribute.rb', line 9

def initialize(opts={})
  set(opts.delete(:value) || :_value_not_set)
  assert_defaults
  extract_from_statement(opts) if opts.has_key?(:statement)
  assert_options(opts)
end

Instance Attribute Details

#datatype ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def datatype
  @datatype
end

#index ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def index
  @index
end

#language ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def language
  @language
end

#name ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def name
  @name
end

#predicate ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def predicate
  @predicate
end

#repository ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def repository
  @repository
end

#reverse ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def reverse
  @reverse
end

#subject_decorator ⇒ Object

Returns the value of attribute subject_decorator.



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# File 'lib/gearbox/attribute.rb', line 7

def subject_decorator
  @subject_decorator
end

#value ⇒ Object

Options to figure out: more index options, routing, triple pattern



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# File 'lib/gearbox/attribute.rb', line 6

def value
  @value
end

Instance Method Details

#literal(opts = {:value => :_value_not_set}) ⇒ Object 



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# File 'lib/gearbox/attribute.rb', line 39

def literal(opts={:value => :_value_not_set})
  value = opts.delete(:value)
  value = to_value if value == :_value_not_set
  opts = {:language => self.language, :datatype => self.datatype}.merge(opts)
  value = case opts[:datatype]
  when :boolean
    RDF::Literal::Boolean.new(value)
  when :date
    RDF::Literal::Date.new(value)
  when :date_time
    RDF::Literal::DateTime.new(value)
  when :decimal
    RDF::Literal::Decimal.new(value)
  when :double
    RDF::Literal::Double.new(value)
  when :time
    RDF::Literal::Time.new(value)
  when :token
    RDF::Literal::Token.new(value)
  when :xml
    RDF::Literal::XML.new(value)
  else
    value
  end
    
  RDF::Literal.new(value, opts)
end

#set(value = :_value_not_set, opts = {}) ⇒ Object 



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# File 'lib/gearbox/attribute.rb', line 67

def set(value=:_value_not_set, opts={})
  opts = {:value => value}.merge(opts)
  @value = literal(opts).object
end

#subject ⇒ Object

TODO: I’m a little quesy about the relationship between the model class, the model, and the attribute. I’m going to have to rebuild the model DSL and see how this stuff gets built.



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# File 'lib/gearbox/attribute.rb', line 22

def subject
  return nil unless subject_decorator
  if subject_decorator.respond_to?(:call)
    subject_decorator.call()
  elsif respond_to?(subject_decorator)
    self.send(subject_decorator)
  else
    nil
  end
end

#to_rdf(model, opts = {}) ⇒ Object 



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# File 'lib/gearbox/attribute.rb', line 72

def to_rdf(model, opts={})
  opts[:value] = :_value_not_set unless opts.has_key?(:value)
  opts = {
    :reverse => self.reverse, 
    :predicate => self.predicate, 
    :value => self.literal(opts)
  }.merge(opts)
  
  subject = self.subject
  subject ||= model.subject
  subject = RDF::URI.new(subject)
  predicate = opts[:predicate]
  object = opts[:value]
  
  return opts[:reverse] ? RDF::Statement(object, predicate, subject)
                 : RDF::Statement(subject, predicate, object)
end

#to_value ⇒ Object Also known as: get 



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# File 'lib/gearbox/attribute.rb', line 33

def to_value
  # Skipping the serialization steps for a moment.
  @value
end